975 lines
36 KiB
C
975 lines
36 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <limits.h>
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#include <assert.h>
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#include <math.h>
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#include "vp9/common/vp9_alloccommon.h"
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#include "vp9/common/vp9_common.h"
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#include "vp9/encoder/vp9_ratectrl.h"
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#include "vp9/common/vp9_entropymode.h"
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#include "vpx_mem/vpx_mem.h"
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#include "vp9/common/vp9_systemdependent.h"
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#include "vp9/encoder/vp9_encodemv.h"
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#include "vp9/common/vp9_quant_common.h"
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#include "vp9/common/vp9_seg_common.h"
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#define LIMIT_QRANGE_FOR_ALTREF_AND_KEY 1
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#define MIN_BPB_FACTOR 0.005
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#define MAX_BPB_FACTOR 50
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// Bits Per MB at different Q (Multiplied by 512)
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#define BPER_MB_NORMBITS 9
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// Tables relating active max Q to active min Q
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static int kf_low_motion_minq[QINDEX_RANGE];
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static int kf_high_motion_minq[QINDEX_RANGE];
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static int gf_low_motion_minq[QINDEX_RANGE];
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static int gf_high_motion_minq[QINDEX_RANGE];
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static int inter_minq[QINDEX_RANGE];
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static int afq_low_motion_minq[QINDEX_RANGE];
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static int afq_high_motion_minq[QINDEX_RANGE];
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static int gf_high = 2000;
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static int gf_low = 400;
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static int kf_high = 5000;
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static int kf_low = 400;
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// Functions to compute the active minq lookup table entries based on a
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// formulaic approach to facilitate easier adjustment of the Q tables.
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// The formulae were derived from computing a 3rd order polynomial best
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// fit to the original data (after plotting real maxq vs minq (not q index))
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static int calculate_minq_index(double maxq,
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double x3, double x2, double x1, double c) {
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int i;
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const double minqtarget = MIN(((x3 * maxq + x2) * maxq + x1) * maxq + c,
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maxq);
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// Special case handling to deal with the step from q2.0
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// down to lossless mode represented by q 1.0.
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if (minqtarget <= 2.0)
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return 0;
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for (i = 0; i < QINDEX_RANGE; i++) {
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if (minqtarget <= vp9_convert_qindex_to_q(i))
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return i;
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}
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return QINDEX_RANGE - 1;
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}
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void vp9_rc_init_minq_luts(void) {
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int i;
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for (i = 0; i < QINDEX_RANGE; i++) {
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const double maxq = vp9_convert_qindex_to_q(i);
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kf_low_motion_minq[i] = calculate_minq_index(maxq,
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0.000001,
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-0.0004,
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0.15,
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0.0);
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kf_high_motion_minq[i] = calculate_minq_index(maxq,
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0.000002,
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-0.0012,
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0.50,
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0.0);
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gf_low_motion_minq[i] = calculate_minq_index(maxq,
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0.0000015,
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-0.0009,
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0.32,
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0.0);
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gf_high_motion_minq[i] = calculate_minq_index(maxq,
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0.0000021,
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-0.00125,
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0.50,
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0.0);
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afq_low_motion_minq[i] = calculate_minq_index(maxq,
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0.0000015,
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-0.0009,
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0.33,
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0.0);
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afq_high_motion_minq[i] = calculate_minq_index(maxq,
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0.0000021,
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-0.00125,
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0.55,
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0.0);
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inter_minq[i] = calculate_minq_index(maxq,
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0.00000271,
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-0.00113,
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0.75,
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0.0);
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}
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}
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// These functions use formulaic calculations to make playing with the
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// quantizer tables easier. If necessary they can be replaced by lookup
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// tables if and when things settle down in the experimental bitstream
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double vp9_convert_qindex_to_q(int qindex) {
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// Convert the index to a real Q value (scaled down to match old Q values)
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return vp9_ac_quant(qindex, 0) / 4.0;
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}
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int vp9_rc_bits_per_mb(FRAME_TYPE frame_type, int qindex,
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double correction_factor) {
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const double q = vp9_convert_qindex_to_q(qindex);
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int enumerator = frame_type == KEY_FRAME ? 3300000 : 2250000;
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// q based adjustment to baseline enumerator
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enumerator += (int)(enumerator * q) >> 12;
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return (int)(0.5 + (enumerator * correction_factor / q));
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}
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void vp9_save_coding_context(VP9_COMP *cpi) {
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CODING_CONTEXT *const cc = &cpi->coding_context;
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VP9_COMMON *cm = &cpi->common;
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// Stores a snapshot of key state variables which can subsequently be
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// restored with a call to vp9_restore_coding_context. These functions are
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// intended for use in a re-code loop in vp9_compress_frame where the
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// quantizer value is adjusted between loop iterations.
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vp9_copy(cc->nmvjointcost, cpi->mb.nmvjointcost);
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vp9_copy(cc->nmvcosts, cpi->mb.nmvcosts);
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vp9_copy(cc->nmvcosts_hp, cpi->mb.nmvcosts_hp);
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vp9_copy(cc->segment_pred_probs, cm->seg.pred_probs);
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vpx_memcpy(cpi->coding_context.last_frame_seg_map_copy,
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cm->last_frame_seg_map, (cm->mi_rows * cm->mi_cols));
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vp9_copy(cc->last_ref_lf_deltas, cm->lf.last_ref_deltas);
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vp9_copy(cc->last_mode_lf_deltas, cm->lf.last_mode_deltas);
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cc->fc = cm->fc;
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}
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void vp9_restore_coding_context(VP9_COMP *cpi) {
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CODING_CONTEXT *const cc = &cpi->coding_context;
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VP9_COMMON *cm = &cpi->common;
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// Restore key state variables to the snapshot state stored in the
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// previous call to vp9_save_coding_context.
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vp9_copy(cpi->mb.nmvjointcost, cc->nmvjointcost);
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vp9_copy(cpi->mb.nmvcosts, cc->nmvcosts);
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vp9_copy(cpi->mb.nmvcosts_hp, cc->nmvcosts_hp);
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vp9_copy(cm->seg.pred_probs, cc->segment_pred_probs);
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vpx_memcpy(cm->last_frame_seg_map,
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cpi->coding_context.last_frame_seg_map_copy,
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(cm->mi_rows * cm->mi_cols));
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vp9_copy(cm->lf.last_ref_deltas, cc->last_ref_lf_deltas);
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vp9_copy(cm->lf.last_mode_deltas, cc->last_mode_lf_deltas);
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cm->fc = cc->fc;
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}
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void vp9_setup_key_frame(VP9_COMP *cpi) {
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VP9_COMMON *cm = &cpi->common;
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vp9_setup_past_independence(cm);
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/* All buffers are implicitly updated on key frames. */
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cpi->refresh_golden_frame = 1;
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cpi->refresh_alt_ref_frame = 1;
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}
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void vp9_setup_inter_frame(VP9_COMP *cpi) {
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VP9_COMMON *cm = &cpi->common;
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if (cm->error_resilient_mode || cm->intra_only)
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vp9_setup_past_independence(cm);
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assert(cm->frame_context_idx < FRAME_CONTEXTS);
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cm->fc = cm->frame_contexts[cm->frame_context_idx];
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}
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static int estimate_bits_at_q(int frame_kind, int q, int mbs,
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double correction_factor) {
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const int bpm = (int)(vp9_rc_bits_per_mb(frame_kind, q, correction_factor));
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// Attempt to retain reasonable accuracy without overflow. The cutoff is
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// chosen such that the maximum product of Bpm and MBs fits 31 bits. The
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// largest Bpm takes 20 bits.
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return (mbs > (1 << 11)) ? (bpm >> BPER_MB_NORMBITS) * mbs
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: (bpm * mbs) >> BPER_MB_NORMBITS;
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}
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static void calc_iframe_target_size(VP9_COMP *cpi) {
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// boost defaults to half second
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int target;
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// Clear down mmx registers to allow floating point in what follows
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vp9_clear_system_state(); // __asm emms;
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// New Two pass RC
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target = cpi->rc.per_frame_bandwidth;
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// For 1-pass.
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if (cpi->pass == 0) {
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if (cpi->common.current_video_frame == 0) {
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target = cpi->oxcf.starting_buffer_level / 2;
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} else {
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// TODO(marpan): Add in adjustment based on Q.
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// If this keyframe was forced, use a more recent Q estimate.
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// int Q = (cpi->common.frame_flags & FRAMEFLAGS_KEY) ?
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// cpi->rc.avg_frame_qindex : cpi->rc.ni_av_qi;
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int initial_boost = 32;
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// Boost depends somewhat on frame rate.
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int kf_boost = MAX(initial_boost, (int)(2 * cpi->output_framerate - 16));
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// Adjustment up based on q: need to fix.
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// kf_boost = kf_boost * kfboost_qadjust(Q) / 100;
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// Frame separation adjustment (down).
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if (cpi->rc.frames_since_key < cpi->output_framerate / 2) {
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kf_boost = (int)(kf_boost * cpi->rc.frames_since_key /
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(cpi->output_framerate / 2));
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}
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kf_boost = (kf_boost < 16) ? 16 : kf_boost;
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target = ((16 + kf_boost) * cpi->rc.per_frame_bandwidth) >> 4;
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}
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cpi->rc.active_worst_quality = cpi->rc.worst_quality;
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}
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if (cpi->oxcf.rc_max_intra_bitrate_pct) {
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int max_rate = cpi->rc.per_frame_bandwidth
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* cpi->oxcf.rc_max_intra_bitrate_pct / 100;
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if (target > max_rate)
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target = max_rate;
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}
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cpi->rc.this_frame_target = target;
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}
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// Update the buffer level: leaky bucket model.
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void vp9_update_buffer_level(VP9_COMP *const cpi, int encoded_frame_size) {
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VP9_COMMON *const cm = &cpi->common;
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// Non-viewable frames are a special case and are treated as pure overhead.
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if (!cm->show_frame) {
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cpi->rc.bits_off_target -= encoded_frame_size;
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} else {
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cpi->rc.bits_off_target += cpi->rc.av_per_frame_bandwidth -
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encoded_frame_size;
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}
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// Clip the buffer level to the maximum specified buffer size.
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if (cpi->rc.bits_off_target > cpi->oxcf.maximum_buffer_size) {
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cpi->rc.bits_off_target = cpi->oxcf.maximum_buffer_size;
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}
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cpi->rc.buffer_level = cpi->rc.bits_off_target;
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}
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int vp9_drop_frame(VP9_COMP *const cpi) {
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if (!cpi->oxcf.drop_frames_water_mark) {
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return 0;
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} else {
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if (cpi->rc.buffer_level < 0) {
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// Always drop if buffer is below 0.
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return 1;
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} else {
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// If buffer is below drop_mark, for now just drop every other frame
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// (starting with the next frame) until it increases back over drop_mark.
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int drop_mark = (int)(cpi->oxcf.drop_frames_water_mark *
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cpi->oxcf.optimal_buffer_level / 100);
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if ((cpi->rc.buffer_level > drop_mark) &&
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(cpi->rc.decimation_factor > 0)) {
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--cpi->rc.decimation_factor;
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} else if (cpi->rc.buffer_level <= drop_mark &&
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cpi->rc.decimation_factor == 0) {
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cpi->rc.decimation_factor = 1;
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}
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if (cpi->rc.decimation_factor > 0) {
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if (cpi->rc.decimation_count > 0) {
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--cpi->rc.decimation_count;
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return 1;
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} else {
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cpi->rc.decimation_count = cpi->rc.decimation_factor;
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return 0;
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}
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} else {
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cpi->rc.decimation_count = 0;
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return 0;
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}
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}
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}
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}
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// Adjust active_worst_quality level based on buffer level.
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static int adjust_active_worst_quality_from_buffer_level(const VP9_COMP *cpi) {
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// Adjust active_worst_quality: If buffer is above the optimal/target level,
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// bring active_worst_quality down depending on fullness over buffer.
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// If buffer is below the optimal level, let the active_worst_quality go from
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// ambient Q (at buffer = optimal level) to worst_quality level
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// (at buffer = critical level).
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int active_worst_quality = cpi->rc.active_worst_quality;
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// Maximum limit for down adjustment, ~20%.
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int max_adjustment_down = active_worst_quality / 5;
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// Buffer level below which we push active_worst to worst_quality.
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int critical_level = cpi->oxcf.optimal_buffer_level >> 2;
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int adjustment = 0;
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int buff_lvl_step = 0;
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if (cpi->rc.buffer_level > cpi->oxcf.optimal_buffer_level) {
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// Adjust down.
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if (max_adjustment_down) {
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buff_lvl_step = (int)((cpi->oxcf.maximum_buffer_size -
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cpi->oxcf.optimal_buffer_level) / max_adjustment_down);
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if (buff_lvl_step) {
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adjustment = (int)((cpi->rc.buffer_level -
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cpi->oxcf.optimal_buffer_level) / buff_lvl_step);
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}
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active_worst_quality -= adjustment;
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}
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} else if (cpi->rc.buffer_level > critical_level) {
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// Adjust up from ambient Q.
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if (critical_level) {
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buff_lvl_step = (cpi->oxcf.optimal_buffer_level - critical_level);
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if (buff_lvl_step) {
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adjustment =
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(cpi->rc.worst_quality - cpi->rc.avg_frame_qindex[INTER_FRAME]) *
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(cpi->oxcf.optimal_buffer_level - cpi->rc.buffer_level) /
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buff_lvl_step;
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}
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active_worst_quality = cpi->rc.avg_frame_qindex[INTER_FRAME] + adjustment;
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}
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} else {
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// Set to worst_quality if buffer is below critical level.
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active_worst_quality = cpi->rc.worst_quality;
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}
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return active_worst_quality;
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}
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// Adjust target frame size with respect to the buffering constraints:
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static int target_size_from_buffer_level(const VP9_COMP *cpi) {
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int this_frame_target = cpi->rc.this_frame_target;
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int percent_low = 0;
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int percent_high = 0;
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int one_percent_bits = (int)(1 + cpi->oxcf.optimal_buffer_level / 100);
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if (cpi->rc.buffer_level < cpi->oxcf.optimal_buffer_level) {
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percent_low = (int)((cpi->oxcf.optimal_buffer_level - cpi->rc.buffer_level)
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/ one_percent_bits);
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if (percent_low > cpi->oxcf.under_shoot_pct) {
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percent_low = cpi->oxcf.under_shoot_pct;
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}
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// Lower the target bandwidth for this frame.
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this_frame_target -= (this_frame_target * percent_low) / 200;
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} else if (cpi->rc.buffer_level > cpi->oxcf.optimal_buffer_level) {
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percent_high = (int)((cpi->rc.buffer_level - cpi->oxcf.optimal_buffer_level)
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/ one_percent_bits);
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if (percent_high > cpi->oxcf.over_shoot_pct) {
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percent_high = cpi->oxcf.over_shoot_pct;
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}
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// Increase the target bandwidth for this frame.
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this_frame_target += (this_frame_target * percent_high) / 200;
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}
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return this_frame_target;
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}
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static void calc_pframe_target_size(VP9_COMP *const cpi) {
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int min_frame_target = MAX(cpi->rc.min_frame_bandwidth,
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cpi->rc.av_per_frame_bandwidth >> 5);
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if (cpi->refresh_alt_ref_frame) {
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// Special alt reference frame case
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// Per frame bit target for the alt ref frame
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cpi->rc.per_frame_bandwidth = cpi->twopass.gf_bits;
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cpi->rc.this_frame_target = cpi->rc.per_frame_bandwidth;
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} else {
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// Normal frames (gf and inter).
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cpi->rc.this_frame_target = cpi->rc.per_frame_bandwidth;
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// Set target frame size based on buffer level, for 1 pass CBR.
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if (cpi->pass == 0 && cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) {
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// Need to decide how low min_frame_target should be for 1-pass CBR.
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// For now, use: cpi->rc.av_per_frame_bandwidth / 16:
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min_frame_target = MAX(cpi->rc.av_per_frame_bandwidth >> 4,
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FRAME_OVERHEAD_BITS);
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cpi->rc.this_frame_target = target_size_from_buffer_level(cpi);
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// Adjust qp-max based on buffer level.
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cpi->rc.active_worst_quality =
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adjust_active_worst_quality_from_buffer_level(cpi);
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}
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}
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// Check that the total sum of adjustments is not above the maximum allowed.
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// That is, having allowed for the KF and GF penalties, we have not pushed
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// the current inter-frame target too low. If the adjustment we apply here is
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// not capable of recovering all the extra bits we have spent in the KF or GF,
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// then the remainder will have to be recovered over a longer time span via
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// other buffer / rate control mechanisms.
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if (cpi->rc.this_frame_target < min_frame_target) {
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cpi->rc.this_frame_target = min_frame_target;
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}
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// Adjust target frame size for Golden Frames:
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if (cpi->refresh_golden_frame) {
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// If we are using alternate ref instead of gf then do not apply the boost
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// It will instead be applied to the altref update
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// Jims modified boost
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if (!cpi->rc.source_alt_ref_active) {
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// The spend on the GF is defined in the two pass code
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// for two pass encodes
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cpi->rc.this_frame_target = cpi->rc.per_frame_bandwidth;
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} else {
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// If there is an active ARF at this location use the minimum
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// bits on this frame even if it is a constructed arf.
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// The active maximum quantizer insures that an appropriate
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// number of bits will be spent if needed for constructed ARFs.
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cpi->rc.this_frame_target = 0;
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}
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}
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}
|
|
|
|
static double get_rate_correction_factor(const VP9_COMP *cpi) {
|
|
if (cpi->common.frame_type == KEY_FRAME) {
|
|
return cpi->rc.key_frame_rate_correction_factor;
|
|
} else {
|
|
if (cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame)
|
|
return cpi->rc.gf_rate_correction_factor;
|
|
else
|
|
return cpi->rc.rate_correction_factor;
|
|
}
|
|
}
|
|
|
|
static void set_rate_correction_factor(VP9_COMP *cpi, double factor) {
|
|
if (cpi->common.frame_type == KEY_FRAME) {
|
|
cpi->rc.key_frame_rate_correction_factor = factor;
|
|
} else {
|
|
if (cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame)
|
|
cpi->rc.gf_rate_correction_factor = factor;
|
|
else
|
|
cpi->rc.rate_correction_factor = factor;
|
|
}
|
|
}
|
|
|
|
void vp9_rc_update_rate_correction_factors(VP9_COMP *cpi, int damp_var) {
|
|
const int q = cpi->common.base_qindex;
|
|
int correction_factor = 100;
|
|
double rate_correction_factor = get_rate_correction_factor(cpi);
|
|
double adjustment_limit;
|
|
|
|
int projected_size_based_on_q = 0;
|
|
|
|
// Clear down mmx registers to allow floating point in what follows
|
|
vp9_clear_system_state(); // __asm emms;
|
|
|
|
// Work out how big we would have expected the frame to be at this Q given
|
|
// the current correction factor.
|
|
// Stay in double to avoid int overflow when values are large
|
|
projected_size_based_on_q = estimate_bits_at_q(cpi->common.frame_type, q,
|
|
cpi->common.MBs,
|
|
rate_correction_factor);
|
|
|
|
// Work out a size correction factor.
|
|
if (projected_size_based_on_q > 0)
|
|
correction_factor =
|
|
(100 * cpi->rc.projected_frame_size) / projected_size_based_on_q;
|
|
|
|
// More heavily damped adjustment used if we have been oscillating either side
|
|
// of target.
|
|
switch (damp_var) {
|
|
case 0:
|
|
adjustment_limit = 0.75;
|
|
break;
|
|
case 1:
|
|
adjustment_limit = 0.375;
|
|
break;
|
|
case 2:
|
|
default:
|
|
adjustment_limit = 0.25;
|
|
break;
|
|
}
|
|
|
|
if (correction_factor > 102) {
|
|
// We are not already at the worst allowable quality
|
|
correction_factor =
|
|
(int)(100 + ((correction_factor - 100) * adjustment_limit));
|
|
rate_correction_factor =
|
|
((rate_correction_factor * correction_factor) / 100);
|
|
|
|
// Keep rate_correction_factor within limits
|
|
if (rate_correction_factor > MAX_BPB_FACTOR)
|
|
rate_correction_factor = MAX_BPB_FACTOR;
|
|
} else if (correction_factor < 99) {
|
|
// We are not already at the best allowable quality
|
|
correction_factor =
|
|
(int)(100 - ((100 - correction_factor) * adjustment_limit));
|
|
rate_correction_factor =
|
|
((rate_correction_factor * correction_factor) / 100);
|
|
|
|
// Keep rate_correction_factor within limits
|
|
if (rate_correction_factor < MIN_BPB_FACTOR)
|
|
rate_correction_factor = MIN_BPB_FACTOR;
|
|
}
|
|
|
|
set_rate_correction_factor(cpi, rate_correction_factor);
|
|
}
|
|
|
|
|
|
int vp9_rc_regulate_q(const VP9_COMP *cpi, int target_bits_per_frame,
|
|
int active_best_quality, int active_worst_quality) {
|
|
int q = active_worst_quality;
|
|
int last_error = INT_MAX;
|
|
int i, target_bits_per_mb, bits_per_mb_at_this_q;
|
|
const double correction_factor = get_rate_correction_factor(cpi);
|
|
|
|
// Calculate required scaling factor based on target frame size and size of
|
|
// frame produced using previous Q.
|
|
if (target_bits_per_frame >= (INT_MAX >> BPER_MB_NORMBITS))
|
|
target_bits_per_mb =
|
|
(target_bits_per_frame / cpi->common.MBs)
|
|
<< BPER_MB_NORMBITS; // Case where we would overflow int
|
|
else
|
|
target_bits_per_mb =
|
|
(target_bits_per_frame << BPER_MB_NORMBITS) / cpi->common.MBs;
|
|
|
|
i = active_best_quality;
|
|
|
|
do {
|
|
bits_per_mb_at_this_q = (int)vp9_rc_bits_per_mb(cpi->common.frame_type, i,
|
|
correction_factor);
|
|
|
|
if (bits_per_mb_at_this_q <= target_bits_per_mb) {
|
|
if ((target_bits_per_mb - bits_per_mb_at_this_q) <= last_error)
|
|
q = i;
|
|
else
|
|
q = i - 1;
|
|
|
|
break;
|
|
} else {
|
|
last_error = bits_per_mb_at_this_q - target_bits_per_mb;
|
|
}
|
|
} while (++i <= active_worst_quality);
|
|
|
|
return q;
|
|
}
|
|
|
|
static int get_active_quality(int q,
|
|
int gfu_boost,
|
|
int low,
|
|
int high,
|
|
int *low_motion_minq,
|
|
int *high_motion_minq) {
|
|
int active_best_quality;
|
|
if (gfu_boost > high) {
|
|
active_best_quality = low_motion_minq[q];
|
|
} else if (gfu_boost < low) {
|
|
active_best_quality = high_motion_minq[q];
|
|
} else {
|
|
const int gap = high - low;
|
|
const int offset = high - gfu_boost;
|
|
const int qdiff = high_motion_minq[q] - low_motion_minq[q];
|
|
const int adjustment = ((offset * qdiff) + (gap >> 1)) / gap;
|
|
active_best_quality = low_motion_minq[q] + adjustment;
|
|
}
|
|
return active_best_quality;
|
|
}
|
|
|
|
int vp9_rc_pick_q_and_adjust_q_bounds(const VP9_COMP *cpi,
|
|
int *bottom_index,
|
|
int *top_index) {
|
|
const VP9_COMMON *const cm = &cpi->common;
|
|
int active_best_quality;
|
|
int active_worst_quality = cpi->rc.active_worst_quality;
|
|
int q;
|
|
|
|
if (frame_is_intra_only(cm)) {
|
|
active_best_quality = cpi->rc.best_quality;
|
|
#if !CONFIG_MULTIPLE_ARF
|
|
// Handle the special case for key frames forced when we have75 reached
|
|
// the maximum key frame interval. Here force the Q to a range
|
|
// based on the ambient Q to reduce the risk of popping.
|
|
if (cpi->rc.this_key_frame_forced) {
|
|
int delta_qindex;
|
|
int qindex = cpi->rc.last_boosted_qindex;
|
|
double last_boosted_q = vp9_convert_qindex_to_q(qindex);
|
|
|
|
delta_qindex = vp9_compute_qdelta(cpi, last_boosted_q,
|
|
(last_boosted_q * 0.75));
|
|
active_best_quality = MAX(qindex + delta_qindex,
|
|
cpi->rc.best_quality);
|
|
} else if (!(cpi->pass == 0 && cpi->common.current_video_frame == 0)) {
|
|
// not first frame of one pass
|
|
double q_adj_factor = 1.0;
|
|
double q_val;
|
|
|
|
// Baseline value derived from cpi->active_worst_quality and kf boost
|
|
active_best_quality = get_active_quality(active_worst_quality,
|
|
cpi->rc.kf_boost,
|
|
kf_low, kf_high,
|
|
kf_low_motion_minq,
|
|
kf_high_motion_minq);
|
|
|
|
// Allow somewhat lower kf minq with small image formats.
|
|
if ((cm->width * cm->height) <= (352 * 288)) {
|
|
q_adj_factor -= 0.25;
|
|
}
|
|
|
|
// Make a further adjustment based on the kf zero motion measure.
|
|
q_adj_factor += 0.05 - (0.001 * (double)cpi->twopass.kf_zeromotion_pct);
|
|
|
|
// Convert the adjustment factor to a qindex delta
|
|
// on active_best_quality.
|
|
q_val = vp9_convert_qindex_to_q(active_best_quality);
|
|
active_best_quality +=
|
|
vp9_compute_qdelta(cpi, q_val, (q_val * q_adj_factor));
|
|
}
|
|
#else
|
|
double current_q;
|
|
// Force the KF quantizer to be 30% of the active_worst_quality.
|
|
current_q = vp9_convert_qindex_to_q(active_worst_quality);
|
|
active_best_quality = active_worst_quality
|
|
+ vp9_compute_qdelta(cpi, current_q, current_q * 0.3);
|
|
#endif
|
|
} else if (!cpi->rc.is_src_frame_alt_ref &&
|
|
(cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
|
|
|
|
// Use the lower of active_worst_quality and recent
|
|
// average Q as basis for GF/ARF best Q limit unless last frame was
|
|
// a key frame.
|
|
if (cpi->rc.frames_since_key > 1 &&
|
|
cpi->rc.avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
|
|
q = cpi->rc.avg_frame_qindex[INTER_FRAME];
|
|
} else {
|
|
q = active_worst_quality;
|
|
}
|
|
// For constrained quality dont allow Q less than the cq level
|
|
if (cpi->oxcf.end_usage == USAGE_CONSTRAINED_QUALITY) {
|
|
if (q < cpi->cq_target_quality)
|
|
q = cpi->cq_target_quality;
|
|
if (cpi->rc.frames_since_key > 1) {
|
|
active_best_quality = get_active_quality(q, cpi->rc.gfu_boost,
|
|
gf_low, gf_high,
|
|
afq_low_motion_minq,
|
|
afq_high_motion_minq);
|
|
} else {
|
|
active_best_quality = get_active_quality(q, cpi->rc.gfu_boost,
|
|
gf_low, gf_high,
|
|
gf_low_motion_minq,
|
|
gf_high_motion_minq);
|
|
}
|
|
// Constrained quality use slightly lower active best.
|
|
active_best_quality = active_best_quality * 15 / 16;
|
|
|
|
} else if (cpi->oxcf.end_usage == USAGE_CONSTANT_QUALITY) {
|
|
if (!cpi->refresh_alt_ref_frame) {
|
|
active_best_quality = cpi->cq_target_quality;
|
|
} else {
|
|
if (cpi->rc.frames_since_key > 1) {
|
|
active_best_quality = get_active_quality(
|
|
q, cpi->rc.gfu_boost, gf_low, gf_high,
|
|
afq_low_motion_minq, afq_high_motion_minq);
|
|
} else {
|
|
active_best_quality = get_active_quality(
|
|
q, cpi->rc.gfu_boost, gf_low, gf_high,
|
|
gf_low_motion_minq, gf_high_motion_minq);
|
|
}
|
|
}
|
|
} else {
|
|
active_best_quality = get_active_quality(
|
|
q, cpi->rc.gfu_boost, gf_low, gf_high,
|
|
gf_low_motion_minq, gf_high_motion_minq);
|
|
}
|
|
} else {
|
|
if (cpi->oxcf.end_usage == USAGE_CONSTANT_QUALITY) {
|
|
active_best_quality = cpi->cq_target_quality;
|
|
} else {
|
|
if (cpi->pass == 0 &&
|
|
cpi->rc.avg_frame_qindex[INTER_FRAME] < active_worst_quality)
|
|
// 1-pass: for now, use the average Q for the active_best, if its lower
|
|
// than active_worst.
|
|
active_best_quality = inter_minq[cpi->rc.avg_frame_qindex[INTER_FRAME]];
|
|
else
|
|
active_best_quality = inter_minq[active_worst_quality];
|
|
|
|
// For the constrained quality mode we don't want
|
|
// q to fall below the cq level.
|
|
if ((cpi->oxcf.end_usage == USAGE_CONSTRAINED_QUALITY) &&
|
|
(active_best_quality < cpi->cq_target_quality)) {
|
|
// If we are strongly undershooting the target rate in the last
|
|
// frames then use the user passed in cq value not the auto
|
|
// cq value.
|
|
if (cpi->rc.rolling_actual_bits < cpi->rc.min_frame_bandwidth)
|
|
active_best_quality = cpi->oxcf.cq_level;
|
|
else
|
|
active_best_quality = cpi->cq_target_quality;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Clip the active best and worst quality values to limits
|
|
if (active_worst_quality > cpi->rc.worst_quality)
|
|
active_worst_quality = cpi->rc.worst_quality;
|
|
|
|
if (active_best_quality < cpi->rc.best_quality)
|
|
active_best_quality = cpi->rc.best_quality;
|
|
|
|
if (active_best_quality > cpi->rc.worst_quality)
|
|
active_best_quality = cpi->rc.worst_quality;
|
|
|
|
if (active_worst_quality < active_best_quality)
|
|
active_worst_quality = active_best_quality;
|
|
|
|
*top_index = active_worst_quality;
|
|
*bottom_index = active_best_quality;
|
|
|
|
#if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
|
|
// Limit Q range for the adaptive loop.
|
|
if (cm->frame_type == KEY_FRAME && !cpi->rc.this_key_frame_forced) {
|
|
if (!(cpi->pass == 0 && cpi->common.current_video_frame == 0)) {
|
|
*top_index =
|
|
(active_worst_quality + active_best_quality * 3) / 4;
|
|
}
|
|
} else if (!cpi->rc.is_src_frame_alt_ref &&
|
|
(cpi->oxcf.end_usage != USAGE_STREAM_FROM_SERVER) &&
|
|
(cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
|
|
*top_index =
|
|
(active_worst_quality + active_best_quality) / 2;
|
|
}
|
|
#endif
|
|
|
|
if (cpi->oxcf.end_usage == USAGE_CONSTANT_QUALITY) {
|
|
q = active_best_quality;
|
|
// Special case code to try and match quality with forced key frames
|
|
} else if ((cm->frame_type == KEY_FRAME) && cpi->rc.this_key_frame_forced) {
|
|
q = cpi->rc.last_boosted_qindex;
|
|
} else {
|
|
q = vp9_rc_regulate_q(cpi, cpi->rc.this_frame_target,
|
|
active_best_quality, active_worst_quality);
|
|
if (q > *top_index)
|
|
q = *top_index;
|
|
}
|
|
#if CONFIG_MULTIPLE_ARF
|
|
// Force the quantizer determined by the coding order pattern.
|
|
if (cpi->multi_arf_enabled && (cm->frame_type != KEY_FRAME) &&
|
|
cpi->oxcf.end_usage != USAGE_CONSTANT_QUALITY) {
|
|
double new_q;
|
|
double current_q = vp9_convert_qindex_to_q(active_worst_quality);
|
|
int level = cpi->this_frame_weight;
|
|
assert(level >= 0);
|
|
new_q = current_q * (1.0 - (0.2 * (cpi->max_arf_level - level)));
|
|
q = active_worst_quality +
|
|
vp9_compute_qdelta(cpi, current_q, new_q);
|
|
|
|
*bottom_index = q;
|
|
*top_index = q;
|
|
printf("frame:%d q:%d\n", cm->current_video_frame, q);
|
|
}
|
|
#endif
|
|
assert(*top_index <= cpi->rc.worst_quality &&
|
|
*top_index >= cpi->rc.best_quality);
|
|
assert(*bottom_index <= cpi->rc.worst_quality &&
|
|
*bottom_index >= cpi->rc.best_quality);
|
|
assert(q <= cpi->rc.worst_quality &&
|
|
q >= cpi->rc.best_quality);
|
|
return q;
|
|
}
|
|
|
|
void vp9_rc_compute_frame_size_bounds(const VP9_COMP *cpi,
|
|
int this_frame_target,
|
|
int *frame_under_shoot_limit,
|
|
int *frame_over_shoot_limit) {
|
|
// Set-up bounds on acceptable frame size:
|
|
if (cpi->oxcf.end_usage == USAGE_CONSTANT_QUALITY) {
|
|
*frame_under_shoot_limit = 0;
|
|
*frame_over_shoot_limit = INT_MAX;
|
|
} else {
|
|
if (cpi->common.frame_type == KEY_FRAME) {
|
|
*frame_over_shoot_limit = this_frame_target * 9 / 8;
|
|
*frame_under_shoot_limit = this_frame_target * 7 / 8;
|
|
} else {
|
|
if (cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) {
|
|
*frame_over_shoot_limit = this_frame_target * 9 / 8;
|
|
*frame_under_shoot_limit = this_frame_target * 7 / 8;
|
|
} else {
|
|
// Stron overshoot limit for constrained quality
|
|
if (cpi->oxcf.end_usage == USAGE_CONSTRAINED_QUALITY) {
|
|
*frame_over_shoot_limit = this_frame_target * 11 / 8;
|
|
*frame_under_shoot_limit = this_frame_target * 2 / 8;
|
|
} else {
|
|
*frame_over_shoot_limit = this_frame_target * 11 / 8;
|
|
*frame_under_shoot_limit = this_frame_target * 5 / 8;
|
|
}
|
|
}
|
|
}
|
|
|
|
// For very small rate targets where the fractional adjustment
|
|
// (eg * 7/8) may be tiny make sure there is at least a minimum
|
|
// range.
|
|
*frame_over_shoot_limit += 200;
|
|
*frame_under_shoot_limit -= 200;
|
|
if (*frame_under_shoot_limit < 0)
|
|
*frame_under_shoot_limit = 0;
|
|
}
|
|
}
|
|
|
|
// return of 0 means drop frame
|
|
int vp9_rc_pick_frame_size_target(VP9_COMP *cpi) {
|
|
VP9_COMMON *cm = &cpi->common;
|
|
|
|
if (cm->frame_type == KEY_FRAME)
|
|
calc_iframe_target_size(cpi);
|
|
else
|
|
calc_pframe_target_size(cpi);
|
|
|
|
// Target rate per SB64 (including partial SB64s.
|
|
cpi->rc.sb64_target_rate = ((int64_t)cpi->rc.this_frame_target * 64 * 64) /
|
|
(cpi->common.width * cpi->common.height);
|
|
return 1;
|
|
}
|
|
|
|
static void update_alt_ref_frame_stats(VP9_COMP *cpi) {
|
|
// this frame refreshes means next frames don't unless specified by user
|
|
cpi->rc.frames_since_golden = 0;
|
|
|
|
#if CONFIG_MULTIPLE_ARF
|
|
if (!cpi->multi_arf_enabled)
|
|
#endif
|
|
// Clear the alternate reference update pending flag.
|
|
cpi->rc.source_alt_ref_pending = 0;
|
|
|
|
// Set the alternate reference frame active flag
|
|
cpi->rc.source_alt_ref_active = 1;
|
|
}
|
|
|
|
static void update_golden_frame_stats(VP9_COMP *cpi) {
|
|
// Update the Golden frame usage counts.
|
|
if (cpi->refresh_golden_frame) {
|
|
// this frame refreshes means next frames don't unless specified by user
|
|
cpi->rc.frames_since_golden = 0;
|
|
|
|
if (!cpi->rc.source_alt_ref_pending)
|
|
cpi->rc.source_alt_ref_active = 0;
|
|
|
|
// Decrement count down till next gf
|
|
if (cpi->rc.frames_till_gf_update_due > 0)
|
|
cpi->rc.frames_till_gf_update_due--;
|
|
|
|
} else if (!cpi->refresh_alt_ref_frame) {
|
|
// Decrement count down till next gf
|
|
if (cpi->rc.frames_till_gf_update_due > 0)
|
|
cpi->rc.frames_till_gf_update_due--;
|
|
|
|
cpi->rc.frames_since_golden++;
|
|
}
|
|
}
|
|
|
|
void vp9_rc_postencode_update(VP9_COMP *cpi, uint64_t bytes_used) {
|
|
VP9_COMMON *const cm = &cpi->common;
|
|
// Update rate control heuristics
|
|
cpi->rc.projected_frame_size = (bytes_used << 3);
|
|
|
|
// Post encode loop adjustment of Q prediction.
|
|
vp9_rc_update_rate_correction_factors(
|
|
cpi, (cpi->sf.recode_loop ||
|
|
cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) ? 2 : 0);
|
|
|
|
// Keep a record of last Q and ambient average Q.
|
|
if (cm->frame_type == KEY_FRAME) {
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|
cpi->rc.last_q[KEY_FRAME] = cm->base_qindex;
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|
cpi->rc.avg_frame_qindex[KEY_FRAME] =
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|
(2 + 3 * cpi->rc.avg_frame_qindex[KEY_FRAME] + cm->base_qindex) >> 2;
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|
} else if (!cpi->rc.is_src_frame_alt_ref &&
|
|
(cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
|
|
cpi->rc.last_q[2] = cm->base_qindex;
|
|
cpi->rc.avg_frame_qindex[2] =
|
|
(2 + 3 * cpi->rc.avg_frame_qindex[2] + cm->base_qindex) >> 2;
|
|
} else {
|
|
cpi->rc.last_q[INTER_FRAME] = cm->base_qindex;
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|
cpi->rc.avg_frame_qindex[INTER_FRAME] =
|
|
(2 + 3 * cpi->rc.avg_frame_qindex[INTER_FRAME] +
|
|
cm->base_qindex) >> 2;
|
|
cpi->rc.ni_frames++;
|
|
cpi->rc.tot_q += vp9_convert_qindex_to_q(cm->base_qindex);
|
|
cpi->rc.avg_q = cpi->rc.tot_q / (double)cpi->rc.ni_frames;
|
|
|
|
// Calculate the average Q for normal inter frames (not key or GFU frames).
|
|
cpi->rc.ni_tot_qi += cm->base_qindex;
|
|
cpi->rc.ni_av_qi = cpi->rc.ni_tot_qi / cpi->rc.ni_frames;
|
|
}
|
|
|
|
// Keep record of last boosted (KF/KF/ARF) Q value.
|
|
// If the current frame is coded at a lower Q then we also update it.
|
|
// If all mbs in this group are skipped only update if the Q value is
|
|
// better than that already stored.
|
|
// This is used to help set quality in forced key frames to reduce popping
|
|
if ((cm->base_qindex < cpi->rc.last_boosted_qindex) ||
|
|
((cpi->static_mb_pct < 100) &&
|
|
((cm->frame_type == KEY_FRAME) || cpi->refresh_alt_ref_frame ||
|
|
(cpi->refresh_golden_frame && !cpi->rc.is_src_frame_alt_ref)))) {
|
|
cpi->rc.last_boosted_qindex = cm->base_qindex;
|
|
}
|
|
|
|
vp9_update_buffer_level(cpi, cpi->rc.projected_frame_size);
|
|
|
|
// Rolling monitors of whether we are over or underspending used to help
|
|
// regulate min and Max Q in two pass.
|
|
if (cm->frame_type != KEY_FRAME) {
|
|
cpi->rc.rolling_target_bits =
|
|
((cpi->rc.rolling_target_bits * 3) +
|
|
cpi->rc.this_frame_target + 2) / 4;
|
|
cpi->rc.rolling_actual_bits =
|
|
((cpi->rc.rolling_actual_bits * 3) +
|
|
cpi->rc.projected_frame_size + 2) / 4;
|
|
cpi->rc.long_rolling_target_bits =
|
|
((cpi->rc.long_rolling_target_bits * 31) +
|
|
cpi->rc.this_frame_target + 16) / 32;
|
|
cpi->rc.long_rolling_actual_bits =
|
|
((cpi->rc.long_rolling_actual_bits * 31) +
|
|
cpi->rc.projected_frame_size + 16) / 32;
|
|
}
|
|
|
|
// Actual bits spent
|
|
cpi->rc.total_actual_bits += cpi->rc.projected_frame_size;
|
|
|
|
// Debug stats
|
|
cpi->rc.total_target_vs_actual += (cpi->rc.this_frame_target -
|
|
cpi->rc.projected_frame_size);
|
|
|
|
#ifndef DISABLE_RC_LONG_TERM_MEM
|
|
// Update bits left to the kf and gf groups to account for overshoot or
|
|
// undershoot on these frames
|
|
if (cm->frame_type == KEY_FRAME) {
|
|
cpi->twopass.kf_group_bits += cpi->rc.this_frame_target -
|
|
cpi->rc.projected_frame_size;
|
|
|
|
cpi->twopass.kf_group_bits = MAX(cpi->twopass.kf_group_bits, 0);
|
|
} else if (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame) {
|
|
cpi->twopass.gf_group_bits += cpi->rc.this_frame_target -
|
|
cpi->rc.projected_frame_size;
|
|
|
|
cpi->twopass.gf_group_bits = MAX(cpi->twopass.gf_group_bits, 0);
|
|
}
|
|
#endif
|
|
|
|
if (cpi->oxcf.play_alternate && cpi->refresh_alt_ref_frame
|
|
&& (cm->frame_type != KEY_FRAME))
|
|
// Update the alternate reference frame stats as appropriate.
|
|
update_alt_ref_frame_stats(cpi);
|
|
else
|
|
// Update the Golden frame stats as appropriate.
|
|
update_golden_frame_stats(cpi);
|
|
|
|
if (cm->frame_type == KEY_FRAME)
|
|
cpi->rc.frames_since_key = 0;
|
|
if (cm->show_frame) {
|
|
cpi->rc.frames_since_key++;
|
|
cpi->rc.frames_to_key--;
|
|
}
|
|
}
|
|
|
|
void vp9_rc_postencode_update_drop_frame(VP9_COMP *cpi) {
|
|
cpi->rc.frames_since_key++;
|
|
// cpi->rc.frames_to_key--;
|
|
}
|